[en] Data integrity methods have been developed and applied to Loss-Of-Fluid Test (LOFT) nuclear reactor safety experiments at the Idaho National Engineering Laboratory. The methods for imroving and qualifying the accuracy of transient measurements on complex thermal-hydraulic experiments are described. These methods involve use of all the information available on the transducers, including data taken during the LOFT experiment itself. Optimum use of these methods determine, in part, the instrumentation package provided on the experiment